The invention discloses a manufacturing process of a business suit collar. The manufacturing process comprises the following steps: folding and placing a collar underlay and a collar underlay woolen textile; fixing the collar underlay with the collar underlay woolen textile; pulling a collar base line on the collar underlay woolen textile; sewing a collar strip on the collar underlay woolen textile; sewing a collar surface; turning and folding a collar base along the collar base line; sewing a collar with a piece of body cloth, and completing the process of manufacturing the collar. By adopting the technical scheme, the collar underlay and the collar underlay woolen textile don't adopt a one-time high temperature underlay bounding process, but a process of sewing the collar surface and the underlay manually, as a result, the collar can be naturally turned over without high temperature ironing and pressing, the natural state of a texture can be kept, consumption of energy is reduced and production cost is lowered. The collar base line adopts shorn notches in two ends, the folding line of the collar underlay is exerted, and is controlled, stiff and smooth and natural lapel formation is ensured, besides, the lapel is matched with the neck of a human body, the tightness is right, and the shape is smooth.